Instrument-sharpening machine



Nov. 2 1,926. y l 1,605,784

H. H. SCHMITT INSTRUMENT SHARPENING MACHINE Filed Oct- 25 1924 2 Sheets-Sheet 1 INVENTOR.

NoNfxJ 2 1926.`

H. H. SCHMETT INSTRUMENT SHARPENING MACHINE Filed Oct. 25 1924 2 Sheets-Sheet 2 INVENToR.

He/e/"Sc/zml,

ATTORNEY.

Patented Nov. l2, 1926.

UNITED STATES s. 1,605,784 PATENT o-FEICE,

HERBERT H. SCHMITT, F PORTLAND, OREGON.

INSTRUMENT-SHARPENING MACHINE. i

Application led October 25, 1924. Serial No. 745,837.

- forth, of an instrument holding device designed particularly for the sharpening of dental and surgical instruments and having means whereby an instrument can bei rigidly held to sharpen and bevel, at any desired angle, the cutting edge thereof.

Another object ofthe invention lis the provision, in a manner as hereinafter set forth, of an instrument holding device adapted to give to an instrumenta cutting edge of any desired bevel, and having lpealrlis t e same kind may be inserted and removed from the device without changing the ad- `justment thereof, thereby providing eacfh of o eX- the instruments with a cutting blade actly the samebevel.

' Still another object -of the invention is the provision, in a manner as hereinafter set forth, of an instrument holding device for giving to cutting instruments, an edge of any desired bevel, and having means whereby the liability of a round edge being formed upon the instrument is entirely eliminated. i I

' Still another object of the invention is the. provision, iir a manner as hereinafter set forth, of a cutting instrument bevelling device having means associated vtherewith by which the device may bevtrued up with `respect to the surface upon which it is operated to give a perfectly beveled and true cutting edge to the instrument being sharpened. v

A further and nal ob]ect of the invention is the provision, in a manner as hereinafter to beset forth, of a Sharpener for giv,

ingA to cutting instruments bevelled edges of any desired angle, which is easily and, quickly set up, capable of `fine andaccurate adjustment, simple inf operation, of neat appearance, strong, durable, and inexpen-V sive to manufacture. J

The invention will be best understood from a consideration of thenfollowing del tailed-description taken inv connection with ingthat t e-invention is not confined the accompan ing drawings forming a part of lthis s eci cation, with the understandany strict conformityy with the showing of the drawings, but may be changedland modified,

so long as such changes and modifications mark no material departure from the salient features of the invention as expressed in the appended claims, g i

In thedrawings, Figure l is a side elevation of the'deviee embodying this invention,

.shown in thev position in which it is used, a

portion thereof being removed before the machine is set in operation.

Figure 2 is a top plan view of the device ,as in use.

Figure 3 is a section taken upon the. line 3--3 of Figure 2.' i

Figure 4 is a section upon the line of Fio'ure l.

Figure, 5 is a section through the basal portion of the device. v

Figure 6 is a plany view of a supporting structure used in connection with the device.

Figure 7 is al detail view of the indicator dial of the device, and f l Figure 8 is a plan view of a pointer member used in connection with the dial'. J Referring nowv to the drawings 'in detail wherein like numerals of reference indicate corresponding parts throughout the several views, the'device embodying this invention comprises two distinct but inter-dependent structures, namely an instrument carrying structure indicated as a whole by the nu-y meral 1, and a parallelometer, indicated generally by the numeral 2,

The instrument carrying structure 1 comprises a base portion of inverted substantially U-shaped conformation, as indicated at 3,'and the terminal4 ends of the arms of this structure 3 are spherical, as indicated at 4, to provide supporting feet. The cen'- tral portion or apex of the base 1 is formed to provide' the vertically positioned centrally apertured collar 5 having the transversely extendingv threaded passage 6 exs tending through one side and opening into .the longitudinal bore therethrough to receive a-thumb nut 7.

Cooperating with the base strmucturel isla lonff'arm 8 of the connecting rod member attened upon one side as at 10,

i and lagainst this attened surface there is secured a semi-circular calibrated dial 11. This dial is secured 'in position by means of the rivets 12 which' extend therethrough and through the end of 'the arm 8. As shown, this dial 11, which comprises a semi-clrcular disc, has a slight extension downwardly along is base portion, as at 13, and the radial center of thedial is provided with an aperture 14, which aperture is positioned upon the longitudinal center of the arm 8 and coincides with an aperture 15 formed through the end 'of the arm. The extension 13 of the dial allows the same to be so .positioned that the aperture 14 may be formed upon the radial center thereof.

The outer end of the arm 8 carries an instrument holder, indicated generally by the numeral 16, and this holder comprises ahead 17 and a threaded longitudinally extending reduced portion 18, which portion extends through the aperture 14 in the plate 11 and the aperture l5 in the end of the arm 8 and.

carries upon its outer end a wing nut 19, which bears against the arm 8 to hold the instrument holder in a position at right angles to the end of the arm 8, as shown clearly in Figures 2.and 3. Upon the face of the shoulder formed between the head 17 and reduced portion 18, there is formed a pair of pin members 201, which pins engage in apertures 21 of a collar 22 which collar has ra central aperture 23 traversed by the reduced portion 18 and carries thereon a pointer 24. This collar and pointer bear against the face of the dial 11 to indicate the desired angle at which the instrument is to be bevelled, as will be explained hereafter.

The head 17 has formed therethrough at right angles to the longitudinal center thereot an instrument receiving aperture 25, and the longitudinal axis of the pointer 24, when in position between the head 17 and the face of the dial 11, is parallel with the longitudinal axis of this passage 25 through the head, thus, whenan instrument 26 is in position in the aperture 25, the longitudinal axis of the handle of the instrument will be parallel with the longitudinal axis of the polnter 24 and consequently when the head vand pointer is revolved to indicate any one of the numerous calibrations upon the disc 11, the instrument will assume the vangle indicated by the ointer upon the dial with respect to the arm and the surface uponv which the machine is supported.

In order to hold the instrument 26 rigidly in position in the aperture 25 to prevent any play therein, a cap 217 is provided which slips over the outer end of the head 17, as shown in Figure 3, and the inner edgeof this cap is provided with the diametrically oppositely positioned notches 27 which engage over the handle of the instrument, as shown in Figure' 1 and a tightening screw 28, havinga reduced threaded portion 29 extending through the outer end of the cap 27 and engaging in the end of the head 17, serves to draw the cap in over the head and forces the instrument 26 tightly against the wall of the passage', 25, thereby holding the same rigidly in position.

The parallelometer, indicated generally by the numeral 2, is not a permanent part of the device itself, that is, it is not attached to the machine when operating the same to sharpen an instrument. Its primary function is to support the longer arm 8 of the connecting rod so as to maintain it in a parextends from the apex of this base a vertical standard 32.

The standard 32 supports a supporting paralleling device, which comprises a central vertical short post member 33 which has extending therethrough an eccentrically positioned aperture 34. This aperture extends longitudinally of the post, as shown in Figure 6. A threaded bore 35 is formed in the post which opens into t-he aperture 34 and into this bore a binding screw 36 is threaded to engage the post 32 and support the paralleling device in position.

Extending from the lower portion of the post 33 is a pair of upwardly curving arms 37 which, as shown in Figure 1, merge at their base to provide an upwardly curving arcuate member, and the upper end of each ot' these arms is finished ott square and has cut in the edge thereof a semi-circular recess 38. As shown in Figure 6, the arms 37 taper toward their upper ends, and they are adapted to receive across their ends in the recesses 38 the long arm 8 of the instrument supporting portion of the machine. rlhese arms, as will be readily seen,may be raised or lowered on the upright rod and fixed at any desired of the arms 37 of the parallelometerand in the recesses 38. .The thumb screw 7 is then loosened to allow the arm 9 to slide lfreely through the head 5 of the base portion and the thumb screw 36 is also loosened to allow the post 33 to slide freely upon the standard 32 to raise or lower the connecting rod to lill) the desired height. When the connecting rod has been positioned vas desired, the thumb nut 36 is tightened against the standard 32 and the thumb nut 7 i'sthen tightened against the short arm 9 ofthe instrument holding structure firmly securing the base 3 in position with the feet 4-upon the surface upon which the device is to work and holding the Varm 8 parallel with the Working surface.

The wing nut`19 is now loosened on the reduced extension 18 of the instrument holder 16, and the instrument `holder is revolved carrying with it the pointer 9AV to set the pointer in a position directed toward any one of the calibrations upon the dial 1l. l/Vhen the pointer has thus been turned in the proper position, setting the passage 25 at the proper angle, the thumb nut 28 is loosened and the handleof the instrument to be sharpened is inserted throughthe passage 25 until the blade thereof rests upon the sharpening stone 30. When in this position the thumb nut 28 is then tightened drawing the cap 27 in upon the head 16 until it engages the instrument 26 and firmly clamps the same in position in the aperture 25. The instrument will now be held at the proper angle to give a bevel of a degree corresponding to the degree indicated by the pointer 24 upon the dial 11. The parallelometer 2 is now removed from beneath the arm 8, and the device isv ready for operation, the .base' 3' serving to support the rear part of the device and the instrument 26 acting as a third leg to support the forward portion of the device. The device 'is then grasped at the bend of the connecting rod with the palm of the hand resting upon the base portion and is given the proper movement across the supporting surface to move the blade of the instrument 26 across the grinding stone 30.

Any desired amount of pressure can be brought to bear upon the instrument by the hand which is guiding the machine back and forth, and owing, to the manner in which the legs or feet-4 .of the base member 3 are pO- y sitioned,'it be impossible for `there to fiat upon the stone 36 be any side 'motion orjswinging ofthe machine to form a round edge upon theinstrw' ment, for the blade thereof is held perfectly atv all times during the operation.

If more'than one instrument of the same type is to be sharpened and each one is to `struments to A be sharpened with a blade bevelled at the same angle. l

From the foregoing description it may be seen that a neat and noveldevice is provided for the sharpening of bevel bladed instru'- ments which will give quick and accurate results.

Having thus described my invention what I claim is:

1. The combination, in a device of the character set forth, of a tool holder comprising a-relatively long arm and a short arm extending at right angles from one end thereof, a base adapted to adjustably receive said short arm, means upon the free Aend of said long arm for adjustably holding an instrument to be sharpened, and vertically adjustable means adapted to temporarily maintain the long arm in horizontal relation tothe supporting surface for said base, while a tool and the base are Xed in position 2. The combination, 'in a device of the character setforth, of a tool fholder com-` prising a relatively long arm and a short arm extending at right angles from one end thereof, a base adapted to adjustably receive saidshort arm, means upoh the free end of saidlong arm for adjustably holding an instrument to be sharpened, and means adapted to temporarily maintain the arm in horizontal relation tothe base supporting surface, comprising a standard, 'a vertically adjustable member carried thereby, and an4 arcuate member carried by said adjustable member, having the ends directed upwardly and provided withrecesses to receive said long arm adjacent each end thereof, as and for the'purpose set forth y Y In testimonyv whereof, I affix my signature hereto.

HERBERT H. SCHMITT. 

